Studies on the aminomalonate decarboxylase of rat liver indicate that this activity is a property of cytoplasmic serine hydroxymethylase. Thus, throughout purification of the enzyme, aminomalonate decarboxylase, serine hydroxymethylase and allothreonine aldolase exhibited the same relative activities. Competition between the several substrates was observed and resolution of the enzyme by treatm...

Fat mass and body condition are important metrics in bioenergetics and physiological studies. They can also link foraging success with demographic rates, making them key components of models that predict population-level outcomes of environmental change. Therefore, it is important to incorporate uncertainty in physiological indicators if results will lead to species management decisions. Matern...

Labelled nuclei were counted in stratified squamous epithelium in mice killed after 24 h intraperitoneal administration of tritiated thymidine to label cells synthesizing deoxyribonucleic acid. Multiple injections produced the same result as an infusion of tritiated thymidine given after 24 h infusion of saline, but infusion of tritiated thymidine alone produced a different result. Thus, cell p...

We have tritium labeled two nucleic acid molecules, an 8 kDa DNA oligomer and a 20 kDa 'hammer-head' RNA for tritium NMR investigations. The DNA sequence studied has been previously used in homonuclear studies of DNA-bound water molecules and tritium NMR was expected to facilitate these investigations by eliminating the need to suppress the water resonance in tritium-detected 3H-1H NOESY experi...

Small streams in urbanized rural areas receive loads of P from various, often episodic, sources. This paper addresses, through a tracer test with 32P, retention and transport pulse input phosphorus 2.6 km long stretch channelized second-order lowland stream. Tritiated water was introduced alongside the 32P-labelled ortophosphate order to isolate influence hydrodynamic factors on behavior. Trace...

THE liquid scintillation technique has achieved considerable popularity as a radioassay method for tritiated water because it combines ease of sample preparation with adequate counting efficiency. However, for low specific activity samples, i.e. samples producing a count approaching that of background, counting times become long and the advantages of the technique become marginal. The purpose o...

Laterally connected vascular bundles in the nodes of sugarcane (Saccharum species cv. Pindar) stalks allow a rapid redistribution of water across the stalk should the vascular continuity be partly disrupted. Tritiated water supplied to the roots exchanged rapidly between the xylem and storage tissue so that net movement up the stalk was slow. The half-time for exchange in a labeled stalk was ab...